Frontend Engineer Frontend Engineer Type: Freelance Hourly Contract Location: Remote This opportunity is for experienced Frontend Engineers and Full-Stack Developers interested in evaluating AI-generated web interfaces and code. The work focuses on comparing AI-generated frontend implementations against real-world reference websites, assessing both visual fidelity and underlying code quality . This is an evaluation-focused role rather than a traditional development position. Render a reference webpage and two AI-generated implementations at a 1920×1080 viewport and evaluate which version most accurately reproduces the reference. Review the source code of AI-generated implementations and assess HTML structure, CSS architecture, responsiveness, maintainability, and implementation quality . Test responsive behavior across different viewport sizes and identify layout or usability defects. 3–8 years of professional web development experience , primarily in frontend or full-stack engineering. ~ Strong hands-on experience with HTML, CSS, JavaScript, responsive web development, and modern frontend engineering practices . ~ Deep understanding of semantic HTML, Flexbox, CSS Grid, media queries, and responsive layouts . ~ Ability to read and understand both modern and legacy web layouts , including float-based and table-based designs. ~ Strong proficiency with browser Developer Tools , including DOM inspection, computed styles, viewport testing, and interactive state debugging. ~ Comfortable working from the command line, including extracting archives, running local development servers,



and troubleshooting asset paths . ~ Sufficient JavaScript knowledge to understand how scripts interact with the DOM and user interactions. ~ Strong professional written English and the ability to provide clear, detailed technical justifications . ~ Prior experience with RLHF, preference labeling, AI model evaluation, structured code review, or human-feedback projects . Pixel-perfect design-to-code experience, including work with design systems, templates, or production web interfaces . Knowledge of web accessibility , including ARIA, semantic landmarks, and heading hierarchy. Familiarity with common failure patterns in AI-generated frontend code . Experience with web scraping, website archiving, DOM parsing, or working with complex crawled website structures . Previous experience completing AI evaluation projects and working in multi-hour evaluation sessions. Ability to run a local development environment and static web server . Important Project Requirements A functioning local development environment is required. The role is intended for practicing web developers with strong frontend and UI implementation expertise. Backend-only, ML/data-science-only, mobile-native-only, and DevOps-only backgrounds are generally not suitable for this evaluation work. Independent contractor engagement. Compensation is based on completed evaluation work in accordance with project requirements. Participate in Resume Evaluation & Interview Stage Hay opciones de teletrabajo/trabajo desde casa disponibles para este puesto.

📌 Frontend Software Engineer (Remote | Up to $90/hr) (España)
🏢 Synthires
📍 España